Door knocker



FIG. 1 is a front elevational view of a door knocker showing our new design;

FIG. 2 is a side elevational view taken from the right of FIG. 1, the side opposite being a mere image thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is an enlarged sectional view taken in the direction of the arrows on line 6--6 of FIG. 1; and

FIG. 7 is an enlarged sectional view taken in the direction of the arrows on line 7--7 of FIG. 4. 

The ornamental design for a door knocker, as shown. 